mac80211: Fix build of rt2800soc
This fixes the following build problem:
```
/drivers/net/wireless/ralink/rt2x00/rt2800soc.c:276:27: error: initialization of 'int (*)(struct platform_device *)' from incompatible pointer type 'void (*)(struct platform_device *)' [-Werror=incompatible-pointer-types]
276 | .remove = rt2x00soc_remove,
| ^~~~~~~~~~~~~~~~
```
Fixes: b4b9288f2aa3 ("mac80211: Update to 6.12.44")
Link: https://github.com/openwrt/openwrt/pull/19946
Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>